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MiniMiniMan

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Member #: 612
Junior Member

17th Jul, 2005 at 06:40:46pm

Hello, I got confused from all the different numbers.

What should be the compression on 1275 cc 1984 austin mini metro engine,

Thanks

BENROSS

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9812 Posts
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Resident Cylinder Head Modifier

Mitsi Evo 7, 911, Cossie. & all the chavs ...... won no problem

18th Jul, 2005 at 06:14:31pm

around 100psi to 120 if the engine is worn !...ish

disconect the ignition remove all the plugs andopen the throttle wide open then take your readings






wolfie

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Somewhere around Swindon

18th Jul, 2005 at 06:29:00pm

one of the things that you should have is all 4 cylinders even

ie all at 120psi or near as dammit or all at 100 ect ect

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Why wolfie...you should have your name as Fuckfaceshithead !


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turbo hogster

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stowmaket suffolk

19th Jul, 2005 at 09:06:57am

dont trust comp testing i got 120 acroos the board but when i done a leak down test it showed i cyl leaked 46 % and the others were leaking to much past the valves, but the comp test showed every thing was fine.

always looking for them bigger bunches of bannanas

matty

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8297 Posts
Member #: 408
Turbo Love Palace Fool

Aylesbury

19th Jul, 2005 at 03:25:03pm

I had a similar thing, you can't always trust a comp test.

A compression test didn't show much difference between cylinders but i still had a missfire, turned out to be a worn cam lobe.

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1/4mile in 13.2sec @ 111 terminal on 15psi

BENROSS

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9812 Posts
Member #: 332
Resident Cylinder Head Modifier

Mitsi Evo 7, 911, Cossie. & all the chavs ...... won no problem

19th Jul, 2005 at 04:30:20pm

yes must agree with the compression test,
it does not give a TRUE accurate picture 100%

only a rough guide!

the best way is a leak down test,
this is the only way to get the true picture

i must agree.

Andys101

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canterbury

20th Jul, 2005 at 11:53:30pm

120 psi seems a tad LOW
but yes a compression test will not tell you all you need to know
carry out a cylinder leakage test as well
a compression test will tell you quickly if somthing drastic has gone wrong


Dangerous

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Swindon

21st Jul, 2005 at 12:42:05am

I got low to middle green bit (gunson gauge)on a standard engine (10-11 bar)??


That with engine warmish.......waste of time doing it stone cold i.e. unrun for a while

Edited by Dangerous on 21st Jul, 2005.


Metro turbo weekend driver,Mini turbo in the making again!


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